xdr_truncate_encode(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 NAME 🎀

okay bestie, welcome to xdr_truncate_encode(9) from the Kernel API Manual — and yes, the manual name is literally right there in the title, slay. 💅

xdr_truncate_encode — truncate an encode buffer

✨ SYNOPSIS ✨

void xdr_truncate_encode (struct xdr_stream *xdr , size_t len );

💅 ARGUMENTS 💅

  • xdr — pointer to xdr_stream
  • len — new length of buffer

🦋 DESCRIPTION 🦋

So what this does is truncate the xdr stream so that xdr->buf->len == len, and xdr->p points at offset len from the start of the buffer, and the head, tail, and page lengths are adjusted to correspond. periodt. ✨

If this means moving xdr->p to a different buffer, we assume that the end pointer should be set to the end of the current page — except in the case of the head buffer, where we assume the head buffer's current length represents the end of the available buffer. 🫶

⚠️ This is not safe to use on a buffer that already has inlined page cache pages (as in a zero-copy server read reply), except for the simple case of truncating from one position in the tail to another. 💀

🌈 SEE ALSO 🌈

Kernel file ./net/sunrpc/xdr.c — plus the whole friend group:

Bye bestie! 💖 This page’s source/version line is ./net/sunrpc, dated October 2026, and it’s the xdr_truncate_encode(9) page. ✨

📦 where this page comes from